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The useful life on batteries are about 3 to 6 years depending on grade of battery. It sounds like you have a draw some where in you system. Stereo? Alarm? Electrical short? Get a multi-meter, or preferably a friend with one who knows how to use it and get to testing. (can your stereo stay on with the truck off?) If you don't solve the problems it will go on and keep killing your batteries.
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